Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 15
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   6 NAME = Fearless Coyote
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.o targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Call message checker as part of the C compilation
 180 #
 181 # Use 'make D=1' to enable checking
 182 # Use 'make D=2' to create the message catalog
 183
 184 ifdef D
 185   ifeq ("$(origin D)", "command line")
 186     KBUILD_KMSG_CHECK = $(D)
 187   endif
 188 endif
 189 ifndef KBUILD_KMSG_CHECK
 190   KBUILD_KMSG_CHECK = 0
 191 endif
 192
 193 # Use make M=dir to specify directory of external module to build
 194 # Old syntax make ... SUBDIRS=$PWD is still supported
 195 # Setting the environment variable KBUILD_EXTMOD take precedence
 196 ifdef SUBDIRS
 197   KBUILD_EXTMOD ?= $(SUBDIRS)
 198 endif
 199
 200 ifeq ("$(origin M)", "command line")
 201   KBUILD_EXTMOD := $(M)
 202 endif
 203
 204 ifeq ($(KBUILD_SRC),)
 205         # building in the source tree
 206         srctree := .
 207 else
 208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 209                 # building in a subdirectory of the source tree
 210                 srctree := ..
 211         else
 212                 srctree := $(KBUILD_SRC)
 213         endif
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 217
 218 objtree         := .
 219 src             := $(srctree)
 220 obj             := $(objtree)
 221
 222 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 223
 224 export srctree objtree VPATH
 225
 226 # To make sure we do not include .config for any of the *config targets
 227 # catch them early, and hand them over to scripts/kconfig/Makefile
 228 # It is allowed to specify more targets when calling make, including
 229 # mixing *config targets and build targets.
 230 # For example 'make oldconfig all'.
 231 # Detect when mixed targets is specified, and make a second invocation
 232 # of make so .config is not included in this case either (for *config).
 233
 234 version_h := include/generated/uapi/linux/version.h
 235 old_version_h := include/linux/version.h
 236
 237 no-dot-config-targets := clean mrproper distclean \
 238                          cscope gtags TAGS tags help% %docs check% coccicheck \
 239                          $(version_h) headers_% archheaders archscripts \
 240                          kernelversion %src-pkg
 241 no-sync-config-targets := $(no-dot-config-targets) install %install
 242
 243 config-targets  := 0
 244 mixed-targets   := 0
 245 dot-config      := 1
 246 may-sync-config := 1
 247
 248 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 249         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 250                 dot-config := 0
 251         endif
 252 endif
 253
 254 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 255         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 256                 may-sync-config := 0
 257         endif
 258 endif
 259
 260 ifneq ($(KBUILD_EXTMOD),)
 261         may-sync-config := 0
 262 endif
 263
 264 ifeq ($(KBUILD_EXTMOD),)
 265         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 266                 config-targets := 1
 267                 ifneq ($(words $(MAKECMDGOALS)),1)
 268                         mixed-targets := 1
 269                 endif
 270         endif
 271 endif
 272 # install and modules_install need also be processed one by one
 273 ifneq ($(filter install,$(MAKECMDGOALS)),)
 274         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 275                 mixed-targets := 1
 276         endif
 277 endif
 278
 279 ifeq ($(mixed-targets),1)
 280 # ===========================================================================
 281 # We're called with mixed targets (*config and build targets).
 282 # Handle them one by one.
 283
 284 PHONY += $(MAKECMDGOALS) __build_one_by_one
 285
 286 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 287         @:
 288
 289 __build_one_by_one:
 290         $(Q)set -e; \
 291         for i in $(MAKECMDGOALS); do \
 292                 $(MAKE) -f $(srctree)/Makefile $$i; \
 293         done
 294
 295 else
 296
 297 # We need some generic definitions (do not try to remake the file).
 298 scripts/Kbuild.include: ;
 299 include scripts/Kbuild.include
 300
 301 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 302 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 303 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 304 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 305
 306 include scripts/subarch.include
 307
 308 # Cross compiling and selecting different set of gcc/bin-utils
 309 # ---------------------------------------------------------------------------
 310 #
 311 # When performing cross compilation for other architectures ARCH shall be set
 312 # to the target architecture. (See arch/* for the possibilities).
 313 # ARCH can be set during invocation of make:
 314 # make ARCH=ia64
 315 # Another way is to have ARCH set in the environment.
 316 # The default ARCH is the host where make is executed.
 317
 318 # CROSS_COMPILE specify the prefix used for all executables used
 319 # during compilation. Only gcc and related bin-utils executables
 320 # are prefixed with $(CROSS_COMPILE).
 321 # CROSS_COMPILE can be set on the command line
 322 # make CROSS_COMPILE=ia64-linux-
 323 # Alternatively CROSS_COMPILE can be set in the environment.
 324 # A third alternative is to store a setting in .config so that plain
 325 # "make" in the configured kernel build directory always uses that.
 326 # Default value for CROSS_COMPILE is not to prefix executables
 327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 328 ARCH            ?= $(SUBARCH)
 329 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 330
 331 # Architecture as present in compile.h
 332 UTS_MACHINE     := $(ARCH)
 333 SRCARCH         := $(ARCH)
 334
 335 # Additional ARCH settings for x86
 336 ifeq ($(ARCH),i386)
 337         SRCARCH := x86
 338 endif
 339 ifeq ($(ARCH),x86_64)
 340         SRCARCH := x86
 341 endif
 342
 343 # Additional ARCH settings for sparc
 344 ifeq ($(ARCH),sparc32)
 345        SRCARCH := sparc
 346 endif
 347 ifeq ($(ARCH),sparc64)
 348        SRCARCH := sparc
 349 endif
 350
 351 # Additional ARCH settings for sh
 352 ifeq ($(ARCH),sh64)
 353        SRCARCH := sh
 354 endif
 355
 356 # Additional ARCH settings for tile
 357 ifeq ($(ARCH),tilepro)
 358        SRCARCH := tile
 359 endif
 360 ifeq ($(ARCH),tilegx)
 361        SRCARCH := tile
 362 endif
 363
 364 KCONFIG_CONFIG  ?= .config
 365 export KCONFIG_CONFIG
 366
 367 # SHELL used by kbuild
 368 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 369           else if [ -x /bin/bash ]; then echo /bin/bash; \
 370           else echo sh; fi ; fi)
 371
 372 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 373 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 374 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 375
 376 HOSTCC       = gcc
 377 HOSTCXX      = g++
 378 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 379                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 380 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 381 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 382 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 383
 384 # Make variables (CC, etc...)
 385 AS              = $(CROSS_COMPILE)as
 386 LD              = $(CROSS_COMPILE)ld
 387 CC              = $(CROSS_COMPILE)gcc
 388 CPP             = $(CC) -E
 389 AR              = $(CROSS_COMPILE)ar
 390 NM              = $(CROSS_COMPILE)nm
 391 STRIP           = $(CROSS_COMPILE)strip
 392 OBJCOPY         = $(CROSS_COMPILE)objcopy
 393 OBJDUMP         = $(CROSS_COMPILE)objdump
 394 AWK             = awk
 395 GENKSYMS        = scripts/genksyms/genksyms
 396 INSTALLKERNEL  := installkernel
 397 DEPMOD          = /sbin/depmod
 398 PERL            = perl
 399 PYTHON          = python
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void $(CF)
 404 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 405 NOSTDINC_FLAGS  =
 406 CFLAGS_MODULE   =
 407 AFLAGS_MODULE   =
 408 LDFLAGS_MODULE  =
 409 CFLAGS_KERNEL   =
 410 AFLAGS_KERNEL   =
 411 LDFLAGS_vmlinux =
 412
 413 # Prefer linux-backports-modules
 414 ifneq ($(KBUILD_SRC),)
 415 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 416 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 417 endif
 418 endif
 419
 420 # Use USERINCLUDE when you must reference the UAPI directories only.
 421 USERINCLUDE    := \
 422                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 423                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 424                 -I$(srctree)/include/uapi \
 425                 -I$(objtree)/include/generated/uapi \
 426                 -include $(srctree)/include/linux/kconfig.h
 427
 428 # Use LINUXINCLUDE when you must reference the include/ directory.
 429 # Needed to be compatible with the O= option
 430 LINUXINCLUDE    := \
 431                 $(UBUNTUINCLUDE) \
 432                 -I$(srctree)/arch/$(SRCARCH)/include \
 433                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 434                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 435                 -I$(objtree)/include \
 436                 $(USERINCLUDE)
 437
 438 # UBUNTU: Include our third party driver stuff too
 439 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 440
 441 KBUILD_AFLAGS   := -D__ASSEMBLY__
 442 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 443                    -fno-strict-aliasing -fno-common -fshort-wchar \
 444                    -Werror-implicit-function-declaration \
 445                    -Wno-format-security \
 446                    -std=gnu89
 447 KBUILD_CPPFLAGS := -D__KERNEL__
 448 KBUILD_AFLAGS_KERNEL :=
 449 KBUILD_CFLAGS_KERNEL :=
 450 KBUILD_AFLAGS_MODULE  := -DMODULE
 451 KBUILD_CFLAGS_MODULE  := -DMODULE
 452 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 453 GCC_PLUGINS_CFLAGS :=
 454
 455 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 456 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 457 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 458 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 459
 460 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 461 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 462 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 463 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 464 export KBUILD_KMSG_CHECK KMSG_CHECK
 465 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 466 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 467 export KBUILD_ARFLAGS
 468
 469 # When compiling out-of-tree modules, put MODVERDIR in the module
 470 # tree rather than in the kernel tree. The kernel tree might
 471 # even be read-only.
 472 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 473
 474 # Files to ignore in find ... statements
 475
 476 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 477                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 478                           -prune -o
 479 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 480                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 481
 482 # ===========================================================================
 483 # Rules shared between *config targets and build targets
 484
 485 # Basic helpers built in scripts/basic/
 486 PHONY += scripts_basic
 487 scripts_basic:
 488         $(Q)$(MAKE) $(build)=scripts/basic
 489         $(Q)rm -f .tmp_quiet_recordmcount
 490
 491 # To avoid any implicit rule to kick in, define an empty command.
 492 scripts/basic/%: scripts_basic ;
 493
 494 PHONY += outputmakefile
 495 # outputmakefile generates a Makefile in the output directory, if using a
 496 # separate output directory. This allows convenient use of make in the
 497 # output directory.
 498 outputmakefile:
 499 ifneq ($(KBUILD_SRC),)
 500         $(Q)ln -fsn $(srctree) source
 501         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 502             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 503 endif
 504
 505 ifeq ($(cc-name),clang)
 506 ifneq ($(CROSS_COMPILE),)
 507 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 508 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 509 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 510 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 511 endif
 512 ifneq ($(GCC_TOOLCHAIN),)
 513 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 514 endif
 515 CLANG_FLAGS     += -no-integrated-as
 516 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 517 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 518 export CLANG_FLAGS
 519 endif
 520
 521 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 522 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 523 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 524 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 525 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 526 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 527 export RETPOLINE_CFLAGS
 528 export RETPOLINE_VDSO_CFLAGS
 529
 530 ifeq ($(config-targets),1)
 531 # ===========================================================================
 532 # *config targets only - make sure prerequisites are updated, and descend
 533 # in scripts/kconfig to make the *config target
 534
 535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 536 # KBUILD_DEFCONFIG may point out an alternative default configuration
 537 # used for 'make defconfig'
 538 include arch/$(SRCARCH)/Makefile
 539 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 540
 541 config: scripts_basic outputmakefile FORCE
 542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 543
 544 %config: scripts_basic outputmakefile FORCE
 545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547 else
 548 # ===========================================================================
 549 # Build targets only - this includes vmlinux, arch specific targets, clean
 550 # targets and others. In general all targets except *config targets.
 551
 552 # If building an external module we do not care about the all: rule
 553 # but instead _all depend on modules
 554 PHONY += all
 555 ifeq ($(KBUILD_EXTMOD),)
 556 _all: all
 557 else
 558 _all: modules
 559 endif
 560
 561 # Decide whether to build built-in, modular, or both.
 562 # Normally, just do built-in.
 563
 564 KBUILD_MODULES :=
 565 KBUILD_BUILTIN := 1
 566
 567 # If we have only "make modules", don't compile built-in objects.
 568 # When we're building modules with modversions, we need to consider
 569 # the built-in objects during the descend as well, in order to
 570 # make sure the checksums are up to date before we record them.
 571
 572 ifeq ($(MAKECMDGOALS),modules)
 573   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 574 endif
 575
 576 # If we have "make <whatever> modules", compile modules
 577 # in addition to whatever we do anyway.
 578 # Just "make" or "make all" shall build modules as well
 579
 580 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 581   KBUILD_MODULES := 1
 582 endif
 583
 584 ifeq ($(MAKECMDGOALS),)
 585   KBUILD_MODULES := 1
 586 endif
 587
 588 export KBUILD_MODULES KBUILD_BUILTIN
 589
 590 ifeq ($(KBUILD_EXTMOD),)
 591 # Additional helpers built in scripts/
 592 # Carefully list dependencies so we do not try to build scripts twice
 593 # in parallel
 594 PHONY += scripts
 595 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 596          asm-generic gcc-plugins
 597         $(Q)$(MAKE) $(build)=$(@)
 598
 599 # Objects we will link into vmlinux / subdirs we need to visit
 600 init-y          := init/
 601 drivers-y       := drivers/ sound/ firmware/ ubuntu/
 602 net-y           := net/
 603 libs-y          := lib/
 604 core-y          := usr/
 605 virt-y          := virt/
 606 endif # KBUILD_EXTMOD
 607
 608 ifeq ($(dot-config),1)
 609 # Read in config
 610 -include include/config/auto.conf
 611
 612 ifeq ($(may-sync-config),1)
 613 # Read in dependencies to all Kconfig* files, make sure to run
 614 # oldconfig if changes are detected.
 615 -include include/config/auto.conf.cmd
 616
 617 # To avoid any implicit rule to kick in, define an empty command
 618 $(KCONFIG_CONFIG): ;
 619
 620 # If .config is newer than include/config/auto.conf, someone tinkered
 621 # with it and forgot to run make oldconfig.
 622 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 623 # we execute the config step to be sure to catch updated Kconfig files
 624 #
 625 # This exploits the 'multi-target pattern rule' trick.
 626 # The syncconfig should be executed only once to make all the targets.
 627 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 628         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 629 else
 630 # External modules and some install targets need include/generated/autoconf.h
 631 # and include/config/auto.conf but do not care if they are up-to-date.
 632 # Use auto.conf to trigger the test
 633 PHONY += include/config/auto.conf
 634
 635 include/config/auto.conf:
 636         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 637         echo >&2;                                                       \
 638         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 639         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 640         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 641         echo >&2 ;                                                      \
 642         /bin/false)
 643
 644 endif # may-sync-config
 645
 646 else
 647 # Dummy target needed, because used as prerequisite
 648 include/config/auto.conf: ;
 649 endif # $(dot-config)
 650
 651 # For the kernel to actually contain only the needed exported symbols,
 652 # we have to build modules as well to determine what those symbols are.
 653 # (this can be evaluated only once include/config/auto.conf has been included)
 654 ifdef CONFIG_TRIM_UNUSED_KSYMS
 655   KBUILD_MODULES := 1
 656 endif
 657
 658 # The all: target is the default when no target is given on the
 659 # command line.
 660 # This allow a user to issue only 'make' to build a kernel including modules
 661 # Defaults to vmlinux, but the arch makefile usually adds further targets
 662 all: vmlinux
 663
 664 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 665 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 666 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 667 export CFLAGS_GCOV CFLAGS_KCOV
 668
 669 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 670 # values of the respective KBUILD_* variables
 671 ARCH_CPPFLAGS :=
 672 ARCH_AFLAGS :=
 673 ARCH_CFLAGS :=
 674 include arch/$(SRCARCH)/Makefile
 675
 676 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 678 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 679 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 680 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 681 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 682
 683 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 684 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 685 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 686 else
 687 ifdef CONFIG_PROFILE_ALL_BRANCHES
 688 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 689 else
 690 KBUILD_CFLAGS   += -O2
 691 endif
 692 endif
 693
 694 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 695                         $(call cc-disable-warning,maybe-uninitialized,))
 696
 697 # Tell gcc to never replace conditional load with a non-conditional one
 698 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 699
 700 # check for 'asm goto'
 701 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 702         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 703         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 704 endif
 705
 706 include scripts/Makefile.kcov
 707 include scripts/Makefile.gcc-plugins
 708
 709 ifdef CONFIG_READABLE_ASM
 710 # Disable optimizations that make assembler listings hard to read.
 711 # reorder blocks reorders the control in the function
 712 # ipa clone creates specialized cloned functions
 713 # partial inlining inlines only parts of functions
 714 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 715                  $(call cc-option,-fno-ipa-cp-clone,) \
 716                  $(call cc-option,-fno-partial-inlining)
 717 endif
 718
 719 ifneq ($(CONFIG_FRAME_WARN),0)
 720 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 721 endif
 722
 723 # This selects the stack protector compiler flag. Testing it is delayed
 724 # until after .config has been reprocessed, in the prepare-compiler-check
 725 # target.
 726 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 727   stackp-flag := -fstack-protector
 728   stackp-name := REGULAR
 729 else
 730 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 731   stackp-flag := -fstack-protector-strong
 732   stackp-name := STRONG
 733 else
 734   # Force off for distro compilers that enable stack protector by default.
 735   stackp-flag := $(call cc-option, -fno-stack-protector)
 736 endif
 737 endif
 738 # Find arch-specific stack protector compiler sanity-checking script.
 739 ifdef CONFIG_CC_STACKPROTECTOR
 740   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 741   stackp-check := $(wildcard $(stackp-path))
 742 endif
 743 KBUILD_CFLAGS += $(stackp-flag)
 744
 745 ifeq ($(cc-name),clang)
 746 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 747 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 748 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 749 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 750 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 751 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 752 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 753 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 754 # See modpost pattern 2
 755 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 756 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 757 else
 758
 759 # These warnings generated too much noise in a regular build.
 760 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 761 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 762 endif
 763
 764 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 765 ifdef CONFIG_FRAME_POINTER
 766 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 767 else
 768 # Some targets (ARM with Thumb2, for example), can't be built with frame
 769 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 770 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 771 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 772 # -fomit-frame-pointer with FUNCTION_TRACER.
 773 ifndef CONFIG_FUNCTION_TRACER
 774 KBUILD_CFLAGS   += -fomit-frame-pointer
 775 endif
 776 endif
 777
 778 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 779
 780 ifdef CONFIG_DEBUG_INFO
 781 ifdef CONFIG_DEBUG_INFO_SPLIT
 782 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 783 else
 784 KBUILD_CFLAGS   += -g
 785 endif
 786 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 787 endif
 788 ifdef CONFIG_DEBUG_INFO_DWARF4
 789 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 790 endif
 791
 792 ifdef CONFIG_DEBUG_INFO_REDUCED
 793 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 794                    $(call cc-option,-fno-var-tracking)
 795 endif
 796
 797 ifdef CONFIG_FUNCTION_TRACER
 798 ifndef CC_FLAGS_FTRACE
 799 CC_FLAGS_FTRACE := -pg
 800 endif
 801 export CC_FLAGS_FTRACE
 802 ifdef CONFIG_HAVE_FENTRY
 803 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 804 endif
 805 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 806 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 807 ifdef CONFIG_DYNAMIC_FTRACE
 808         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 809                 BUILD_C_RECORDMCOUNT := y
 810                 export BUILD_C_RECORDMCOUNT
 811         endif
 812 endif
 813 endif
 814
 815 # We trigger additional mismatches with less inlining
 816 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 817 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 818 endif
 819
 820 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 821 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 822 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 823 endif
 824
 825 # arch Makefile may override CC so keep this after arch Makefile is included
 826 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 827 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 828
 829 # warn about C99 declaration after statement
 830 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 831
 832 # disable pointer signed / unsigned warnings in gcc 4.0
 833 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 834
 835 # disable stringop warnings in gcc 8+
 836 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 837
 838 # disable invalid "can't wrap" optimizations for signed / pointers
 839 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 840
 841 # clang sets -fmerge-all-constants by default as optimization, but this
 842 # is non-conforming behavior for C and in fact breaks the kernel, so we
 843 # need to disable it here generally.
 844 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 845
 846 # for gcc -fno-merge-all-constants disables everything, but it is fine
 847 # to have actual conforming behavior enabled.
 848 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 849
 850 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 851 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 852
 853 # conserve stack if available
 854 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 855
 856 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 857 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 858
 859 # require functions to have arguments in prototypes, not empty 'int foo()'
 860 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 861
 862 # Prohibit date/time macros, which would make the build non-deterministic
 863 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 864
 865 # enforce correct pointer usage
 866 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 867
 868 # Require designated initializers for all marked structures
 869 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 870
 871 # use the deterministic mode of AR if available
 872 KBUILD_ARFLAGS := $(call ar-option,D)
 873
 874 include scripts/Makefile.kasan
 875 include scripts/Makefile.extrawarn
 876 include scripts/Makefile.ubsan
 877
 878 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 879 # last assignments
 880 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 881 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 882 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 883
 884 # Use --build-id when available.
 885 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 886                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 887 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 888 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 889
 890 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 891 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 892 endif
 893
 894 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 895 LDFLAGS_vmlinux += $(call ld-option, -X,)
 896 endif
 897
 898 # Default kernel image to build when no specific target is given.
 899 # KBUILD_IMAGE may be overruled on the command line or
 900 # set in the environment
 901 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 902 # this default value
 903 export KBUILD_IMAGE ?= vmlinux
 904
 905 #
 906 # INSTALL_PATH specifies where to place the updated kernel and system map
 907 # images. Default is /boot, but you can set it to other values
 908 export  INSTALL_PATH ?= /boot
 909
 910 #
 911 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 912 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 913 # an argument if needed. Otherwise it defaults to the kernel install path
 914 #
 915 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 916
 917 #
 918 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 919 # relocations required by build roots.  This is not defined in the
 920 # makefile but the argument can be passed to make if needed.
 921 #
 922
 923 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 924 export MODLIB
 925
 926 #
 927 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 928 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 929 # the default option --strip-debug will be used.  Otherwise,
 930 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 931
 932 ifdef INSTALL_MOD_STRIP
 933 ifeq ($(INSTALL_MOD_STRIP),1)
 934 mod_strip_cmd = $(STRIP) --strip-debug
 935 else
 936 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 937 endif # INSTALL_MOD_STRIP=1
 938 else
 939 mod_strip_cmd = true
 940 endif # INSTALL_MOD_STRIP
 941 export mod_strip_cmd
 942
 943 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 944 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 945 # or CONFIG_MODULE_COMPRESS_XZ.
 946
 947 mod_compress_cmd = true
 948 ifdef CONFIG_MODULE_COMPRESS
 949   ifdef CONFIG_MODULE_COMPRESS_GZIP
 950     mod_compress_cmd = gzip -n -f
 951   endif # CONFIG_MODULE_COMPRESS_GZIP
 952   ifdef CONFIG_MODULE_COMPRESS_XZ
 953     mod_compress_cmd = xz -f
 954   endif # CONFIG_MODULE_COMPRESS_XZ
 955 endif # CONFIG_MODULE_COMPRESS
 956 export mod_compress_cmd
 957
 958 # Select initial ramdisk compression format, default is gzip(1).
 959 # This shall be used by the dracut(8) tool while creating an initramfs image.
 960 #
 961 INITRD_COMPRESS-y                  := gzip
 962 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 963 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 964 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 965 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 966 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 967 # do not export INITRD_COMPRESS, since we didn't actually
 968 # choose a sane default compression above.
 969 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 970
 971 ifdef CONFIG_MODULE_SIG_ALL
 972 $(eval $(call config_filename,MODULE_SIG_KEY))
 973
 974 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 975 else
 976 mod_sign_cmd = true
 977 endif
 978 export mod_sign_cmd
 979
 980 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 981
 982 ifdef CONFIG_STACK_VALIDATION
 983   has_libelf := $(call try-run,\
 984                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 985   ifeq ($(has_libelf),1)
 986     objtool_target := tools/objtool FORCE
 987   else
 988     SKIP_STACK_VALIDATION := 1
 989     export SKIP_STACK_VALIDATION
 990   endif
 991 endif
 992
 993
 994 ifeq ($(KBUILD_EXTMOD),)
 995 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 996
 997 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 998                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 999                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1000
1001 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1002                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1003
1004 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
1005 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1006 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1007 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1008 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1009 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1010 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1011
1012 # Externally visible symbols (used by link-vmlinux.sh)
1013 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1014 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1015 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1016 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1017 export LDFLAGS_vmlinux
1018 # used by scripts/package/Makefile
1019 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1020
1021 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1022
1023 # Include targets which we want to execute sequentially if the rest of the
1024 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1025 # evaluated more than once.
1026 PHONY += vmlinux_prereq
1027 vmlinux_prereq: $(vmlinux-deps) FORCE
1028 ifdef CONFIG_HEADERS_CHECK
1029         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1030 endif
1031 ifdef CONFIG_GDB_SCRIPTS
1032         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1033 endif
1034 ifdef CONFIG_TRIM_UNUSED_KSYMS
1035         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1036           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1037 endif
1038
1039 # standalone target for easier testing
1040 include/generated/autoksyms.h: FORCE
1041         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1042
1043 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1044
1045 # Final link of vmlinux with optional arch pass after final link
1046 cmd_link-vmlinux =                                                 \
1047         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1048         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1049
1050 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1051         +$(call if_changed,link-vmlinux)
1052
1053 # Build samples along the rest of the kernel
1054 ifdef CONFIG_SAMPLES
1055 vmlinux-dirs += samples
1056 endif
1057
1058 # The actual objects are generated when descending,
1059 # make sure no implicit rule kicks in
1060 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1061
1062 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1063 # Preset locale variables to speed up the build process. Limit locale
1064 # tweaks to this spot to avoid wrong language settings when running
1065 # make menuconfig etc.
1066 # Error messages still appears in the original language
1067
1068 PHONY += $(vmlinux-dirs)
1069 $(vmlinux-dirs): prepare scripts
1070         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1071
1072 define filechk_kernel.release
1073         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1074 endef
1075
1076 # Store (new) KERNELRELEASE string in include/config/kernel.release
1077 include/config/kernel.release: include/config/auto.conf FORCE
1078         $(call filechk,kernel.release)
1079
1080
1081 # Things we need to do before we recursively start building the kernel
1082 # or the modules are listed in "prepare".
1083 # A multi level approach is used. prepareN is processed before prepareN-1.
1084 # archprepare is used in arch Makefiles and when processed asm symlink,
1085 # version.h and scripts_basic is processed / created.
1086
1087 # Listed in dependency order
1088 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1089
1090 # prepare3 is used to check if we are building in a separate output directory,
1091 # and if so do:
1092 # 1) Check that make has not been executed in the kernel src $(srctree)
1093 prepare3: include/config/kernel.release
1094 ifneq ($(KBUILD_SRC),)
1095         @$(kecho) '  Using $(srctree) as source for kernel'
1096         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1097                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1098                 echo >&2 "  in the '$(srctree)' directory.";\
1099                 /bin/false; \
1100         fi;
1101 endif
1102
1103 # prepare2 creates a makefile if using a separate output directory.
1104 # From this point forward, .config has been reprocessed, so any rules
1105 # that need to depend on updated CONFIG_* values can be checked here.
1106 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1107
1108 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1109                    include/config/auto.conf
1110         $(cmd_crmodverdir)
1111
1112 archprepare: archheaders archscripts prepare1 scripts_basic
1113
1114 prepare0: archprepare gcc-plugins
1115         $(Q)$(MAKE) $(build)=.
1116
1117 # All the preparing..
1118 prepare: prepare0 prepare-objtool
1119
1120 # Support for using generic headers in asm-generic
1121 PHONY += asm-generic uapi-asm-generic
1122 asm-generic: uapi-asm-generic
1123         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1124                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1125 uapi-asm-generic:
1126         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1127                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1128
1129 PHONY += prepare-objtool
1130 prepare-objtool: $(objtool_target)
1131 ifeq ($(SKIP_STACK_VALIDATION),1)
1132 ifdef CONFIG_UNWINDER_ORC
1133         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1134         @false
1135 else
1136         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1137 endif
1138 endif
1139
1140 # Check for CONFIG flags that require compiler support. Abort the build
1141 # after .config has been processed, but before the kernel build starts.
1142 #
1143 # For security-sensitive CONFIG options, we don't want to fallback and/or
1144 # silently change which compiler flags will be used, since that leads to
1145 # producing kernels with different security feature characteristics
1146 # depending on the compiler used. (For example, "But I selected
1147 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1148 PHONY += prepare-compiler-check
1149 prepare-compiler-check: FORCE
1150 # Make sure compiler supports requested stack protector flag.
1151 ifdef stackp-name
1152   ifeq ($(call cc-option, $(stackp-flag)),)
1153         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1154                   $(stackp-flag) not supported by compiler >&2 && exit 1
1155   endif
1156 endif
1157 # Make sure compiler does not have buggy stack-protector support.
1158 ifdef stackp-check
1159   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1160         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1161                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1162   endif
1163 endif
1164         @:
1165
1166 # Generate some files
1167 # ---------------------------------------------------------------------------
1168
1169 # KERNELRELEASE can change from a few different places, meaning version.h
1170 # needs to be updated, so this check is forced on all builds
1171
1172 uts_len := 64
1173 define filechk_utsrelease.h
1174         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1175           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1176           exit 1;                                                         \
1177         fi;                                                               \
1178         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1179 endef
1180
1181 define filechk_version.h
1182         (echo \#define LINUX_VERSION_CODE $(shell                         \
1183         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1184         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1185 endef
1186
1187 $(version_h): $(srctree)/Makefile FORCE
1188         $(call filechk,version.h)
1189         $(Q)rm -f $(old_version_h)
1190
1191 include/generated/utsrelease.h: include/config/kernel.release FORCE
1192         $(call filechk,utsrelease.h)
1193
1194 PHONY += headerdep
1195 headerdep:
1196         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1197         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1198
1199 # ---------------------------------------------------------------------------
1200 # Kernel headers
1201
1202 #Default location for installed headers
1203 export INSTALL_HDR_PATH = $(objtree)/usr
1204
1205 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1206 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1207
1208 PHONY += archheaders
1209 archheaders:
1210
1211 PHONY += archscripts
1212 archscripts:
1213
1214 PHONY += __headers
1215 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1216         $(Q)$(MAKE) $(build)=scripts build_unifdef
1217
1218 PHONY += headers_install_all
1219 headers_install_all:
1220         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1221
1222 PHONY += headers_install
1223 headers_install: __headers
1224         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1225           $(error Headers not exportable for the $(SRCARCH) architecture))
1226         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1227         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1228         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1229
1230 PHONY += headers_check_all
1231 headers_check_all: headers_install_all
1232         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1233
1234 PHONY += headers_check
1235 headers_check: headers_install
1236         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1237         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1238         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1239
1240 # ---------------------------------------------------------------------------
1241 # Kernel selftest
1242
1243 PHONY += kselftest
1244 kselftest:
1245         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1246
1247 PHONY += kselftest-clean
1248 kselftest-clean:
1249         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1250
1251 PHONY += kselftest-merge
1252 kselftest-merge:
1253         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1254         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1255                 -m $(objtree)/.config \
1256                 $(srctree)/tools/testing/selftests/*/config
1257         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1258
1259 # ---------------------------------------------------------------------------
1260 # Modules
1261
1262 ifdef CONFIG_MODULES
1263
1264 # By default, build modules as well
1265
1266 all: modules
1267
1268 # Build modules
1269 #
1270 # A module can be listed more than once in obj-m resulting in
1271 # duplicate lines in modules.order files.  Those are removed
1272 # using awk while concatenating to the final file.
1273
1274 PHONY += modules
1275 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1276         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1277         @$(kecho) '  Building modules, stage 2.';
1278         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1279
1280 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1281         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1282
1283 %/modules.builtin: include/config/auto.conf
1284         $(Q)$(MAKE) $(modbuiltin)=$*
1285
1286
1287 # Target to prepare building external modules
1288 PHONY += modules_prepare
1289 modules_prepare: prepare scripts
1290
1291 # Target to install modules
1292 PHONY += modules_install
1293 modules_install: _modinst_ _modinst_post
1294
1295 PHONY += _modinst_
1296 _modinst_:
1297         @rm -rf $(MODLIB)/kernel
1298         @rm -f $(MODLIB)/source
1299         @mkdir -p $(MODLIB)/kernel
1300         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1301         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1302                 rm -f $(MODLIB)/build ; \
1303                 ln -s $(CURDIR) $(MODLIB)/build ; \
1304         fi
1305         @cp -f $(objtree)/modules.order $(MODLIB)/
1306         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1307         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1308
1309 # This depmod is only for convenience to give the initial
1310 # boot a modules.dep even before / is mounted read-write.  However the
1311 # boot script depmod is the master version.
1312 PHONY += _modinst_post
1313 _modinst_post: _modinst_
1314         $(call cmd,depmod)
1315
1316 ifeq ($(CONFIG_MODULE_SIG), y)
1317 PHONY += modules_sign
1318 modules_sign:
1319         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1320 endif
1321
1322 else # CONFIG_MODULES
1323
1324 # Modules not configured
1325 # ---------------------------------------------------------------------------
1326
1327 PHONY += modules modules_install
1328 modules modules_install:
1329         @echo >&2
1330         @echo >&2 "The present kernel configuration has modules disabled."
1331         @echo >&2 "Type 'make config' and enable loadable module support."
1332         @echo >&2 "Then build a kernel with module support enabled."
1333         @echo >&2
1334         @exit 1
1335
1336 endif # CONFIG_MODULES
1337
1338 ###
1339 # Cleaning is done on three levels.
1340 # make clean     Delete most generated files
1341 #                Leave enough to build external modules
1342 # make mrproper  Delete the current configuration, and all generated files
1343 # make distclean Remove editor backup files, patch leftover files and the like
1344
1345 # Directories & files removed with 'make clean'
1346 CLEAN_DIRS  += $(MODVERDIR)
1347
1348 # Directories & files removed with 'make mrproper'
1349 MRPROPER_DIRS  += include/config usr/include include/generated          \
1350                   arch/*/include/generated .tmp_objdiff
1351 MRPROPER_FILES += .config .config.old .version \
1352                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1353                   signing_key.pem signing_key.priv signing_key.x509     \
1354                   x509.genkey extra_certificates signing_key.x509.keyid \
1355                   signing_key.x509.signer vmlinux-gdb.py
1356
1357 # clean - Delete most, but leave enough to build external modules
1358 #
1359 clean: rm-dirs  := $(CLEAN_DIRS)
1360 clean: rm-files := $(CLEAN_FILES)
1361 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1362
1363 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1364 $(clean-dirs):
1365         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1366
1367 vmlinuxclean:
1368         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1369         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1370
1371 clean: archclean vmlinuxclean
1372
1373 # mrproper - Delete all generated files, including .config
1374 #
1375 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1376 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1377 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1378
1379 PHONY += $(mrproper-dirs) mrproper archmrproper
1380 $(mrproper-dirs):
1381         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1382
1383 mrproper: clean archmrproper $(mrproper-dirs)
1384         $(call cmd,rmdirs)
1385         $(call cmd,rmfiles)
1386
1387 # distclean
1388 #
1389 PHONY += distclean
1390
1391 distclean: mrproper
1392         @find $(srctree) $(RCS_FIND_IGNORE) \
1393                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1394                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1395                 -o -name 'core' \) \
1396                 -type f -print | xargs rm -f
1397
1398
1399 # Packaging of the kernel to various formats
1400 # ---------------------------------------------------------------------------
1401 # rpm target kept for backward compatibility
1402 package-dir     := scripts/package
1403
1404 %src-pkg: FORCE
1405         $(Q)$(MAKE) $(build)=$(package-dir) $@
1406 %pkg: include/config/kernel.release FORCE
1407         $(Q)$(MAKE) $(build)=$(package-dir) $@
1408 rpm: rpm-pkg
1409         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1410         @echo "           Please use \"rpm-pkg\" instead."
1411
1412
1413 # Brief documentation of the typical targets used
1414 # ---------------------------------------------------------------------------
1415
1416 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1417 boards := $(sort $(notdir $(boards)))
1418 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1419 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1420
1421 PHONY += help
1422 help:
1423         @echo  'Cleaning targets:'
1424         @echo  '  clean           - Remove most generated files but keep the config and'
1425         @echo  '                    enough build support to build external modules'
1426         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1427         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1428         @echo  ''
1429         @echo  'Configuration targets:'
1430         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1431         @echo  ''
1432         @echo  'Other generic targets:'
1433         @echo  '  all             - Build all targets marked with [*]'
1434         @echo  '* vmlinux         - Build the bare kernel'
1435         @echo  '* modules         - Build all modules'
1436         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1437         @echo  '  dir/            - Build all files in dir and below'
1438         @echo  '  dir/file.[ois]  - Build specified target only'
1439         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1440         @echo  '                    (requires compiler support for LLVM assembly generation)'
1441         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1442         @echo  '                    (requires a recent binutils and recent build (System.map))'
1443         @echo  '  dir/file.ko     - Build module including final link'
1444         @echo  '  modules_prepare - Set up for building external modules'
1445         @echo  '  tags/TAGS       - Generate tags file for editors'
1446         @echo  '  cscope          - Generate cscope index'
1447         @echo  '  gtags           - Generate GNU GLOBAL index'
1448         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1449         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1450         @echo  '  image_name      - Output the image name (use with make -s)'
1451         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1452          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1453          echo  ''
1454         @echo  'Static analysers:'
1455         @echo  '  checkstack      - Generate a list of stack hogs'
1456         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1457         @echo  '  versioncheck    - Sanity check on version.h usage'
1458         @echo  '  includecheck    - Check for duplicate included header files'
1459         @echo  '  export_report   - List the usages of all exported symbols'
1460         @echo  '  headers_check   - Sanity check on exported headers'
1461         @echo  '  headerdep       - Detect inclusion cycles in headers'
1462         @echo  '  coccicheck      - Check with Coccinelle'
1463         @echo  ''
1464         @echo  'Kernel selftest:'
1465         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1466         @echo  '                    Build, install, and boot kernel before'
1467         @echo  '                    running kselftest on it'
1468         @echo  '  kselftest-clean - Remove all generated kselftest files'
1469         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1470         @echo  '                    .config.'
1471         @echo  ''
1472         @echo 'Userspace tools targets:'
1473         @echo '  use "make tools/help"'
1474         @echo '  or  "cd tools; make help"'
1475         @echo  ''
1476         @echo  'Kernel packaging:'
1477         @$(MAKE) $(build)=$(package-dir) help
1478         @echo  ''
1479         @echo  'Documentation targets:'
1480         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1481         @echo  ''
1482         @echo  'Architecture specific targets ($(SRCARCH)):'
1483         @$(if $(archhelp),$(archhelp),\
1484                 echo '  No architecture specific help defined for $(SRCARCH)')
1485         @echo  ''
1486         @$(if $(boards), \
1487                 $(foreach b, $(boards), \
1488                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1489                 echo '')
1490         @$(if $(board-dirs), \
1491                 $(foreach b, $(board-dirs), \
1492                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1493                 printf "  %-16s - Show all of the above\\n" help-boards; \
1494                 echo '')
1495
1496         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1497         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1498         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1499         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1500         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1501         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1502         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1503         @echo  '                1: warnings which may be relevant and do not occur too often'
1504         @echo  '                2: warnings which occur quite often but may still be relevant'
1505         @echo  '                3: more obscure warnings, can most likely be ignored'
1506         @echo  '                Multiple levels can be combined with W=12 or W=123'
1507         @echo  ''
1508         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1509         @echo  'For further info see the ./README file'
1510
1511
1512 help-board-dirs := $(addprefix help-,$(board-dirs))
1513
1514 help-boards: $(help-board-dirs)
1515
1516 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1517
1518 $(help-board-dirs): help-%:
1519         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1520         @$(if $(boards-per-dir), \
1521                 $(foreach b, $(boards-per-dir), \
1522                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1523                 echo '')
1524
1525
1526 # Documentation targets
1527 # ---------------------------------------------------------------------------
1528 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1529                linkcheckdocs dochelp refcheckdocs
1530 PHONY += $(DOC_TARGETS)
1531 $(DOC_TARGETS): scripts_basic FORCE
1532         $(Q)$(MAKE) $(build)=Documentation $@
1533
1534 else # KBUILD_EXTMOD
1535
1536 ###
1537 # External module support.
1538 # When building external modules the kernel used as basis is considered
1539 # read-only, and no consistency checks are made and the make
1540 # system is not used on the basis kernel. If updates are required
1541 # in the basis kernel ordinary make commands (without M=...) must
1542 # be used.
1543 #
1544 # The following are the only valid targets when building external
1545 # modules.
1546 # make M=dir clean     Delete all automatically generated files
1547 # make M=dir modules   Make all modules in specified dir
1548 # make M=dir           Same as 'make M=dir modules'
1549 # make M=dir modules_install
1550 #                      Install the modules built in the module directory
1551 #                      Assumes install directory is already created
1552
1553 # We are always building modules
1554 KBUILD_MODULES := 1
1555 PHONY += crmodverdir
1556 crmodverdir:
1557         $(cmd_crmodverdir)
1558
1559 PHONY += $(objtree)/Module.symvers
1560 $(objtree)/Module.symvers:
1561         @test -e $(objtree)/Module.symvers || ( \
1562         echo; \
1563         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1564         echo "           is missing; modules will have no dependencies and modversions."; \
1565         echo )
1566
1567 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1568 PHONY += $(module-dirs) modules
1569 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1570         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1571
1572 modules: $(module-dirs)
1573         @$(kecho) '  Building modules, stage 2.';
1574         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1575
1576 PHONY += modules_install
1577 modules_install: _emodinst_ _emodinst_post
1578
1579 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1580 PHONY += _emodinst_
1581 _emodinst_:
1582         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1583         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1584
1585 PHONY += _emodinst_post
1586 _emodinst_post: _emodinst_
1587         $(call cmd,depmod)
1588
1589 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1590
1591 PHONY += $(clean-dirs) clean
1592 $(clean-dirs):
1593         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1594
1595 clean:  rm-dirs := $(MODVERDIR)
1596 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1597
1598 PHONY += help
1599 help:
1600         @echo  '  Building external modules.'
1601         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1602         @echo  ''
1603         @echo  '  modules         - default target, build the module(s)'
1604         @echo  '  modules_install - install the module'
1605         @echo  '  clean           - remove generated files in module directory only'
1606         @echo  ''
1607
1608 # Dummies...
1609 PHONY += prepare scripts
1610 prepare: ;
1611 scripts: ;
1612 endif # KBUILD_EXTMOD
1613
1614 clean: $(clean-dirs)
1615         $(call cmd,rmdirs)
1616         $(call cmd,rmfiles)
1617         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1618                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1619                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1620                 -o -name '*.dwo' -o -name '*.lst' \
1621                 -o -name '*.su'  \
1622                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1623                 -o -name '*.symtypes' -o -name 'modules.order' \
1624                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1625                 -o -name .cache.mk \
1626                 -o -name '*.c.[012]*.*' \
1627                 -o -name '*.ll' \
1628                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1629
1630 # Generate tags for editors
1631 # ---------------------------------------------------------------------------
1632 quiet_cmd_tags = GEN     $@
1633       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1634
1635 tags TAGS cscope gtags: FORCE
1636         $(call cmd,tags)
1637
1638 # Scripts to check various things for consistency
1639 # ---------------------------------------------------------------------------
1640
1641 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1642
1643 includecheck:
1644         find $(srctree)/* $(RCS_FIND_IGNORE) \
1645                 -name '*.[hcS]' -type f -print | sort \
1646                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1647
1648 versioncheck:
1649         find $(srctree)/* $(RCS_FIND_IGNORE) \
1650                 -name '*.[hcS]' -type f -print | sort \
1651                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1652
1653 coccicheck:
1654         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1655
1656 namespacecheck:
1657         $(PERL) $(srctree)/scripts/namespace.pl
1658
1659 export_report:
1660         $(PERL) $(srctree)/scripts/export_report.pl
1661
1662 endif #ifeq ($(config-targets),1)
1663 endif #ifeq ($(mixed-targets),1)
1664
1665 PHONY += checkstack kernelrelease kernelversion image_name
1666
1667 # UML needs a little special treatment here.  It wants to use the host
1668 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1669 # else wants $(ARCH), including people doing cross-builds, which means
1670 # that $(SUBARCH) doesn't work here.
1671 ifeq ($(ARCH), um)
1672 CHECKSTACK_ARCH := $(SUBARCH)
1673 else
1674 CHECKSTACK_ARCH := $(ARCH)
1675 endif
1676 checkstack:
1677         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1678         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1679
1680 kernelrelease:
1681         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1682
1683 kernelversion:
1684         @echo $(KERNELVERSION)
1685
1686 image_name:
1687         @echo $(KBUILD_IMAGE)
1688
1689 # Clear a bunch of variables before executing the submake
1690 tools/: FORCE
1691         $(Q)mkdir -p $(objtree)/tools
1692         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1693
1694 tools/%: FORCE
1695         $(Q)mkdir -p $(objtree)/tools
1696         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1697
1698 # Single targets
1699 # ---------------------------------------------------------------------------
1700 # Single targets are compatible with:
1701 # - build with mixed source and output
1702 # - build with separate output dir 'make O=...'
1703 # - external modules
1704 #
1705 #  target-dir => where to store outputfile
1706 #  build-dir  => directory in kernel source tree to use
1707
1708 ifeq ($(KBUILD_EXTMOD),)
1709         build-dir  = $(patsubst %/,%,$(dir $@))
1710         target-dir = $(dir $@)
1711 else
1712         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1713         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1714         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1715 endif
1716
1717 %.s: %.c prepare scripts FORCE
1718         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1719 %.i: %.c prepare scripts FORCE
1720         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1721 %.o: %.c prepare scripts FORCE
1722         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1723 %.lst: %.c prepare scripts FORCE
1724         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1725 %.s: %.S prepare scripts FORCE
1726         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1727 %.o: %.S prepare scripts FORCE
1728         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1729 %.symtypes: %.c prepare scripts FORCE
1730         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1731 %.ll: %.c prepare scripts FORCE
1732         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1733
1734 # Modules
1735 /: prepare scripts FORCE
1736         $(cmd_crmodverdir)
1737         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1738         $(build)=$(build-dir)
1739 # Make sure the latest headers are built for Documentation
1740 Documentation/ samples/: headers_install
1741 %/: prepare scripts FORCE
1742         $(cmd_crmodverdir)
1743         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1744         $(build)=$(build-dir)
1745 %.ko: prepare scripts FORCE
1746         $(cmd_crmodverdir)
1747         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1748         $(build)=$(build-dir) $(@:.ko=.o)
1749         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1750
1751 # FIXME Should go into a make.lib or something
1752 # ===========================================================================
1753
1754 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1755       cmd_rmdirs = rm -rf $(rm-dirs)
1756
1757 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1758       cmd_rmfiles = rm -f $(rm-files)
1759
1760 # Run depmod only if we have System.map and depmod is executable
1761 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1762       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1763                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1764
1765 # Create temporary dir for module support files
1766 # clean it up only when building all modules
1767 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1768                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1769
1770 # read all saved command lines
1771
1772 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1773
1774 ifneq ($(cmd_files),)
1775   $(cmd_files): ;       # Do not try to update included dependency files
1776   include $(cmd_files)
1777 endif
1778
1779 endif   # skip-makefile
1780
1781 PHONY += FORCE
1782 FORCE:
1783
1784 # Declare the contents of the .PHONY variable as phony.  We keep that
1785 # information in a variable so we can use it in if_changed and friends.
1786 .PHONY: $(PHONY)